11705521 has 4 divisors (see below), whose sum is σ = 11714544. Its totient is φ = 11696500.

The previous prime is 11705471. The next prime is 11705549. The reversal of 11705521 is 12550711.

11705521 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12550711 = 43 ⋅291877.

It is a cyclic number.

It is not a de Polignac number, because 11705521 - 2²¹ = 9608369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11705492 and 11705501.

It is not an unprimeable number, because it can be changed into a prime (11705581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155 + ... + 5296.

It is an arithmetic number, because the mean of its divisors is an integer number (2928636).

Almost surely, 2^11705521 is an apocalyptic number.

It is an amenable number.

11705521 is a deficient number, since it is larger than the sum of its proper divisors (9023).

11705521 is an equidigital number, since it uses as much as digits as its factorization.

11705521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9022.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 11705521 is about 3421.3332196674. Note that the first 3 decimals coincide. The cubic root of 11705521 is about 227.0545710300.

The spelling of 11705521 in words is "eleven million, seven hundred five thousand, five hundred twenty-one".